>>> secretary of defense leon panetta arrived in iraq sunday after a visit to afghanistan. it's his first visit since taking office july 1st. three or four rockets hit the green zone in baghdad early this morning, an apparent signal from insurgents that they were aware of panetta's arrival. 15 soldiers were killed in iraq last month. panetta said iraqi extremists are being armed by iran with sophisticated weapons they're using to find and kill american forces. >> we're very concerned about iran and weapons they're providing to extremists here in iraq. and the reality is that we've seen the results of that in june. we lost a hell of a lot of americans as a result of those attacks. >> reporter: secretary panetta also said he is requesting that iraqi security forces step up security for american troops. if that doesn't happen, he said he has the sole authority to order u.s. military forces to conduct combat operations against the insurgents. >>> the fbi is leading an investigation into the discovery of a stun gun on board a jetblue airplane. cleaning staff found the device, wh